The pub/sub functions in the MQTT client worked without any trouble.
The Log tab in the client can provide useful information if you run into any trouble.
If there are any connection issues the cause should appear in the Log.

Doug Toppin's Blog

I have been in software systems development for my entire career and am a private pilot. I used to think I might be able to turn being a pilot into a job but am still waiting for the US Air Force to call me up. My interests include cloud stuff, AWS, Linux, OSX, iOS, NodeJS and augmented reality. I also have a variety of technology, film-making and political interests and am always willing to talk about any of them.